ChimpTest

Memory test where you try to beat a chimpanzee. Numbers flash, hide, tap them back in order. Based on the 2007 Kyoto University study where Ayumu the chimp kept ~80% accuracy at 210ms flashes. 3 strikes, escalating speed, ?r= challenge links to dare friends. Stats stay on your device. Vanilla JS, no framework — runs entirely in the browser, hosted on Cloudflare.